From: The diversity and evolution of chelicerate hemocyanins
Split | Bounds | Â | Strata | Fossils | Reference |
---|---|---|---|---|---|
 | Max | Min |  |  |  |
Euchelicerata-Pycnogonida | 543 | 501 | lower bound: first arthropods in the Early Cambrian upper bound: base of Upper Cambrian | Rusophycus; Cambropycnogon klausmuelleri | Benton 1993 [41], Crimes 1987 [45], Waloszek and Dunlop 2002 [46] |
origin of Xiphosura | Â | 445 | Late Ordovician | Lunataspis aurora | Rudkin et al. 2008 [47] |
origin of Scorpiones | Â | 428 | Silurian | Allopalaeophonus caledonicus | Dunlop 2010 [43] |
Mygalomorphae-Araneaomorphae | 382.7 | 240 | lower bound: Grès à meules, upper Buntsandstein, Trias; upper bound: Givetian, middle Devonian | Rosamygale grauvogeli; Attercopus fimbriunguis |